IZAAYAAA!!!! (Shizaya Fanfic)

*I DO NOT OWN ANY OF DURARARA'S CHARACTERS THIS IS SIMPLY A FANFIC FOR FUN*
(After the events of Durarara X2)

Life in the city has become boring. I'm becoming desensitized to the constant bussle of people. This boredom has left me to sit and think, and I mean actually think about my life.
All of the things I've done.
I can't help but laugh as I realize that I actually feel guilty.
What even is my purpose here anyway?
Do I actually matter?
I really am a psychopath, like they've all called me.

Izaya starts becoming aware of a growing feeling of guilt growing inside him. He starts acting strangely and many of the people arround him start to notice a change. How will the individual characters deal with this new development, and who will be able to stop Izaya from his self destructive path? (Mainly a Shizaya fanfic with some other character ships added)